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How to write a plugin register mechanism, that can register own icons, commands, handlers etc. [message #1360785]

Sat, 17 May 2014 00:05

Simon Schäfer

Messages: 14
Registered: June 2011

Junior Member

I have created an extension point that allows extensions to set things like a class to execute or the addition of an optional icon.

The problem now is that I don't know how to register extensions in the Eclipse runtime. I know that I can access all the available extensions with

org.eclipse.core.runtime.Platform.getExtensionRegistry().getConfigurationElementsFor(id)

I get all the information I need from the extensions but I'm unable to find a way to register, say, a command + a handler + a corresponding icon that would allow me to call the class (which is provided by the extension) by executing this command.

The org.eclipse.ui.newWizards extension for example does something similar. How can I implement something similar?

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Re: How to write a plugin register mechanism, that can register own icons, commands, handlers etc. [message #1364035 is a reply to message #1360785]

Sun, 18 May 2014 09:36

tony hedoux

Messages: 19
Registered: May 2012

Junior Member

You have to instantiate dynamically the class from the information you gather.

First you have to found all the contributors to your extension point :

 
// Get registry
        IExtensionRegistry extensionRegistry = Platform.getExtensionRegistry();

// Get one of the contribution for your extension point
        IExtension currentExtension : vExtensionRegistry.getExtensionPoint(EXTENSION_POINT_ID).getExtensions()[0]

Then read the configuration elements

IConfigurationElement commandConfElement = currentExtension.getConfigurationElements()[0];

Then instantiate it

Command myCommand = (Command) vElement.createExecutableExtension(name of the attribute détails);

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Re: How to write a plugin register mechanism, that can register own icons, commands, handlers etc. [message #1364149 is a reply to message #1364035]

Sun, 18 May 2014 10:48

Simon Schäfer

Messages: 14
Registered: June 2011

Junior Member

Thanks for your reply, but createExecutableExtension creates an instance of a class, it doesn't register a command in the platform (or even associate an icon with a command). Therefore it can only be cast to the type of the class and not to org.eclipse.core.commands.Command.

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